func InEpsilonSlice(t TestingT, expected, actual interface{}, delta float64, msgAndArgs ...interface{}) bool {
    if expected == nil || actual == nil ||
        reflect.TypeOf(actual).Kind() != reflect.Slice ||
        reflect.TypeOf(expected).Kind() != reflect.Slice {
        return Fail(t, fmt.Sprintf("Parameters must be slice"), msgAndArgs...)